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'
' Visual Basic.Net COmpiler
' Copyright (C) 2004 - 2006 Rolf Bjarne Kvinge, rbjarnek at users.sourceforge.net
'
' This library is free software; you can redistribute it and/or
' modify it under the terms of the GNU Lesser General Public
' License as published by the Free Software Foundation; either
' version 2.1 of the License, or (at your option) any later version.
'
' This library is distributed in the hope that it will be useful,
' but WITHOUT ANY WARRANTY; without even the implied warranty of
' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
' Lesser General Public License for more details.
'
' You should have received a copy of the GNU Lesser General Public
' License along with this library; if not, write to the Free Software
' Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
'
Public Class FileComparer
Public Shared Function Compare(ByVal File1 As String, ByVal File2 As String) As Boolean
Dim size As Long
size = New IO.FileInfo(File1).Length
If New IO.FileInfo(File2).Length <> size Then Return False
Const BUFFERSIZE As Integer = 1024
Dim buffer1(BUFFERSIZE - 1) As Byte
Dim buffer2(BUFFERSIZE - 1) As Byte
Dim read1, read2 As Integer
Dim left As Long = size
Using stream1 As New IO.FileStream(File1, IO.FileMode.Open, IO.FileAccess.Read, IO.FileShare.ReadWrite, CInt(buffer1.Length), IO.FileOptions.SequentialScan), stream2 As New IO.FileStream(File1, IO.FileMode.Open, IO.FileAccess.Read, IO.FileShare.ReadWrite, BUFFERSIZE, IO.FileOptions.SequentialScan)
Do Until left = 0
read1 = stream1.Read(buffer1, 0, BUFFERSIZE)
read2 = stream2.Read(buffer2, 0, BUFFERSIZE)
If read1 <> read2 Then Return False
For i As Integer = 0 To read1 - 1
If buffer1(i) <> buffer2(i) Then Return False
Next
left -= read1
Loop
End Using
Return True
End Function
End Class
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